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Gentoo: RAR Format string and buffer overflow vulnerabilities Print E-mail
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Posted by Benjamin D. Thomas   
Gentoo RAR contains a format string error and a buffer overflow vulnerability that may be used to execute arbitrary code.
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Gentoo Linux Security Advisory                           GLSA 200511-10
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                                            http://security.gentoo.org/
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  Severity: Normal
     Title: RAR: Format string and buffer overflow vulnerabilities
      Date: November 13, 2005
      Bugs: #111926
        ID: 200511-10

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Synopsis
========

RAR contains a format string error and a buffer overflow vulnerability
that may be used to execute arbitrary code.

Background
==========

RAR is a powerful archive manager that can decompress RAR, ZIP and
other files, and can create new archives in RAR and ZIP file format.

Affected packages
=================

    -------------------------------------------------------------------
     Package       /  Vulnerable  /                         Unaffected
    -------------------------------------------------------------------
  1  app-arch/rar       < 3.5.1                               >= 3.5.1

Description
===========

Tan Chew Keong reported about two vulnerabilities found in RAR:

* A format string error exists when displaying a diagnostic error
  message that informs the user of an invalid filename in an UUE/XXE
  encoded file.

* Some boundary errors in the processing of malicious ACE archives
  can be exploited to cause a buffer overflow.

Impact
======

A remote attacker could exploit these vulnerabilities by enticing a
user to:

* decode a specially crafted UUE/XXE file, or

* extract a malicious ACE archive containing a file with an overly
  long filename.

When the user performs these actions, the arbitrary code of the
attacker's choice will be executed.

Workaround
==========

There is no known workaround at this time.

Resolution
==========

All RAR users should upgrade to the latest version:

    # emerge --sync
    # emerge --ask --oneshot --verbose ">=app-arch/rar-3.5.1"

References
==========

  [ 1 ] RAR Release Notes
        http://www.rarlabs.com/rarnew.htm
  [ 2 ] Secunia Research 11/10/2005
        http://secunia.com/secunia_research/2005-53/advisory/

Availability
============

This GLSA and any updates to it are available for viewing at
the Gentoo Security Website:

  http://security.gentoo.org/glsa/glsa-200511-10.xml

Concerns?
=========

Security is a primary focus of Gentoo Linux and ensuring the
confidentiality and security of our users machines is of utmost
importance to us. Any security concerns should be addressed to
security@gentoo.org or alternatively, you may file a bug at
http://bugs.gentoo.org.

License
=======

Copyright 2005 Gentoo Foundation, Inc; referenced text
belongs to its owner(s).

The contents of this document are licensed under the
Creative Commons - Attribution / Share Alike license.

http://creativecommons.org/licenses/by-sa/2.0
 
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